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PULSATOR.

APPLICATION FILED FEB. 17, 1915- 3 SHEETSSHEET I.

klmumlioz W. M. MEHRING.

PULSATOR. I APPLICATION FILED FEB-17,!915- 1,355,839. Patented Oct. 19,1920.

' a SHEETS-SHEET 2'.

W. M. MEHRlNG.

PULSATOR.

APPLICATION' FILED. EE B.17,1-915.

Patented Oct. 19, 1920.

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UNITED STATES PATENT OFFICE.

WILLIAM M. MEI-IRING, OF KEYMAR, MARYLAND.

Specification of Letters Patent.

Patented Oct. 19, 1920.

Application filed February 17, 1915. Serial No. 8,738.

larly with coW-milkers, its function being to partially" or wholly interrupt the vac uum, thus creatingan intermittent suction upon the cows udder as in the sucking of a calf; V p

A further object is to provide a simple, light and efi'ective pulsator of such construction that" it maybe cheaply constructed and quickly assembled and easily cleaned at all times to make it sanitary, provision being made to create a direct passage for the milk, in the main without coming in contact with the working parts of the pulsator.

In the accompanying drawings Figure 1 is a view in perspective of my improved pulsator;

Fig. 2 is a plan view with the pistons shown in dotted lines in one position;

Fig. 3 is a view in plan and partly 'in horizontal section showing the pistons moved to their opposite positions;

Fig. 4 is a longitudinal vertical section through the secondary suction-valve;

Figs. 5, 6,7 and 8 are horizontal sections through the central gate or valve taken in different planes, and with the gate in different positions; Fig. 9 is a view through the secondary valveat right-angles to the view shown in Fig. 4'

Figs. 10 and 11 are horizontal sections through the secondary valve showing it turned in two different positions;

Fig. 12 is aview in perspective of the central valve or gate; and

Fig. 13 is a similar view of the secondary valv i i A, represents a straight brass pipe or tube, it being the main pipe of the pulsator,

' through which the milk is drawn by suction from th efpip e '1, which is fastened thereto byany approved form of coupling 2. the suction of course being from a suitable suction-pump (not shown) through the hose or pipe 4 in the cover 5 of the can'C,

a short hose 6 extending from the nipple 7 of the pulsator to the cover of the milkcan. Y

Of course it is understood that the pipe 1 is kept supplied from the hose 8, of which there are several connected with pipe 1,but only one illustrated in Fig. 1; and these hose are connected with the teat-cups 9, and

each of these is provided with valve or gate 10 and a main cook 11 for controlling the suction through the cups 9, 9, and the hose 8. 7

At or near thecenter of the main pipe A, the tapering gate orprimary valve 12 is fitted to turn in its valve-seat 13. This valve or gate 12, has the main central port 14c extending directly and diametrically therethrough, as shownin full lines in Figs. 5, 8 and 12, and in dotted lines in Figs. 2

and 3. WVhen the primary gate or valve It 1.2 is turned to its normal position, as

shown in dotted lines in Fig. 3, and full lines in Fig. 8, the full force of the suction created by the pump is being exerted, and

, the'milk is flowing through the pulsator to all four cylinders being closed at their outer ends and open at their inner ends as shown.

in Fig. 3', and the two eylindersa and b on one side preferably being somewhat larger in diameter than cylinders 0 and d on the other side of the main pipe A, as

illustrated. Y l The pistons a, o,'-c, d, are fitted re: spectively to the cylinders a, b, 0, c5, and these pistons are connected in'pairs by means of the rods16, 17, 18 and 19. The inner ends of the piston-rods 16- and 17 come together, and'are pivotally connected with the stem 20 of the central gate or pri-' mary valve 12, as shown in Figs. 1, 2 and A secondary valve 21 shownfin Fig. 13 has a stem 22 which in similar fashion is connected with the inner ends of the piston rods l8' and 19. This secondary valve 21 controls the oscillations of the central gate 21 preferably tapers also and fitted toga,

tapering "valve-Seat 23.

The secondary wilve 21 is located at the juncture of the three air-ducts 24, 25 and 26, as best shown in Figs. 10 and 11. Tubes 27 and 28 preferably of rubber extend from the nipples at the outer ends of the ducts 25 and 26 to the ports 29 and 30 located respectively at the outer ends of the cylinders a and 71, and the duct 24, leads directly into the mainpipe A, as shown in Figs. 10 and 11. Screws 31, 32 and 33 are placed in the holes 31, 32, and 33 in these several ducts 24, 25 and 26 respectively, for adjusting the size of the passage therethrough. The secondary valve 21 is provided with the two ducts 34 and each having a lateral duct 36 and 37 respectively at the center.

Tubes 40 and 41, preferably of rubber similar to tubes 27 and 28, extend from the nipples 42 and at the outer ends of the ducts 44 and 45 in the central or primary valve casing to the ports 46 and 4-7 located at the outer ends of the cylinders c and (1 respectively, and the primary valve or gate 12 is provided with the ports 48, 49, and 56 for a purpose which will be explained.

A relief-valve 50 is located in a lateral chamber 51 opening into the primary valve seat 13, and the tension of the spring 52 sleeved on the stem 53 of this valve 50 is regulated by the nuts 54 screwed on the threaded outer end of the stem 53. The purpose of this valve 50 is to prevent the absolute interruption to the suction, in other words to maintain a partial vacuum even with the pulsations, so as to aflford sufiicient suction to keep the cups from dropping from the cow to the floor, even when the passage through the pipe is intermittently closed, and the lateral duct 49 is in communication with the pipe A when the main port 14 is closed, as shown in Fig. 5; and as the air enters through the valve 50 to restore equilibrium, as shown in Fig. 5, there is just suflicient vacuum to hold the cups in place.

Now in the operation of the pulsator, the parts we shall say are normally in the position shown in Fig. 3. This means that the port 14 is wide open, as shown in Figs. 3 and 8,and the suction from the pum is drawing the milk through the pipes 1 and 6 into the can, the valve 50 being closed,

. due to the tension of the spring 52. The

duct 35 is in registry with the ducts 24 and 26, and the ducts 34 and 36 with the air inlet- 58 and the duct 25 respectively, as shown in Fig. 10, which causes a suction through the tube 28 and port 30 in the outer end of cylinder 6, creating a vacuum or partial vacuum therein, and atthe same time restoring atmos heric pressure from air-inlet 58 through dilcts 34, 36, 25, tube 27, and

- port 29 at the outer end of cylinder a.

This causes the pistons band a to move toward said port 30, due to the atmospheric pressure on the opposite end of piston I). This swings the primary valve-stem 20 into the position shown in Fig. 2, reversing the primary valve or gate 12, shutting off the flow of milk through pipe A (as shown -in"Fig. 5), and resulting in the ,valve 50 opening and allowing air to flow into pipe A, as indicated by the arrows at the left in Fig. 5. This causes theduct 56 in the primary gate or valve 12 to establish communication between the suction pump at the right-hand side of the primary valve or gate 12 and the tube 40, which causes a suction at theouter end of cylinder 0, and at the same time causes duct 55 to register with the airinlet 57 and the tube 41 at the outer end of cylinder d, thus equalizing the pressure on the two sides of piston d, pistons 0' and d moving to the left and swlnging the secondary valve-stem 22 to the position shown in Fig. 2, and causing the reversal of the secondary valve 21, or its movement to the position shown in Fig. 11, which means that communication is established through duct 34 between the tube 27 and the pipe This causes the air to be sucked out of cylinder a, and atmospheric pressure to be restored in cylinder 1) through tube 28 and ducts 37 and 35 in secondary valve 21, at mospheric air being admitted through the air-inlet 59, as shown in Fig. 11. This causes the pistons a and b to return to the left as shown in Fig. 3, carrying the stem 20 of the primary valve 12, and re-opening the passage through pipe A, as shown in Figs. 3 and 8. This again applies suction to tube 11 through registry. of duct 56 therewith .(and the exhaustion of air from the right-hand end of cylinder d) and with the pipe A, and it restores atmospheric air pressure through tube 40 to cylinder 0, thereby moving the pistons 0 and d to the right as indicated by thearrow in Fig. 3, and the secondary valve-stem to the position therein indicated, thus completing a full cycle of operations, and restoring all parts to the position shown in Fig. 3, after which the op eration repeats itself as long as the suctionpump is in operation and the milking operation continues, thus causing the desired pulsation or intermittent suction upon the udder and the holding of the cups in place.

Thus it will be seen that the milk is confined in its passage to the pipe A, and through the port 14 of the primary gate or valve 12. In other words, the milk is thus confined and kept from contamination by contact with any of the other parts of the pulsator. In consequence,-the passage for the milk can be easily cleaned at any time, and be kept sweet and h gienic. Consesequently the valve 21 an the pistons a, b, c, d, can at all times be kept well oiled,

them.

I claim:

1. A pulsator comprising a main pipe, a primary valve or gate located therein and having ports, means for actuating said primary valve, a relief valve located in a lateral chamber opening into the primary valve-seat, and adapted to communicate with the ports thereof, teat-cups in communication with the main pipe, and means for creating an air circulation through the main pipe and causing a circulation through the valve, whereby said relief Valve is automatically actuated.

2. A pulsator including a main pipe, a primary valve in said pipe, a secondary valve or gate subject to the pneumatic pres sure in said pipe, suction means comprising cylinders and pistons operated by the pneumatic pressure in said pipe under control of the primary and secondary valves, for actuating said valves, and means for regulating the size of the ports of one of the valves for controlling the passage of fluid therethrough.

In testimony whereof I affix my signature, in the presence of two witnesses.

WILLIAM M. MEHRING. Witnesses:

S. RAYMOND SEWARD, WV. H. B. ANDERS. 

